20ft vs 40ft Shipping Container: Which Size Should You Buy?

Choosing between a 20ft vs 40ft shipping container comes down to three things: how much you need to store, how much room you have to place it, and your budget. Both are the same 8 feet wide, so the decision is really about length and how that changes everything around it.

The dimensions

A standard 20' container measures 20 feet long, 8 feet wide, and 8'6" tall, giving you roughly 1,170 cubic feet of interior space. A standard 40' container is exactly double the length at 40 feet long, with the same width and height, and holds about 2,390 cubic feet. If you order a 40' high cube, the height jumps to 9'6", adding noticeably more vertical room for tall pallets or shelving.

Space you need to place it

The 40' container holds more, but it also demands more. You need a long, level run for it, and the delivery truck needs straight-line clearance to slide it off a tilt-bed. A 20' container fits tighter lots, smaller yards, and residential driveways far more easily. If access is tight or the ground is uneven, the 20' is often the realistic choice regardless of capacity.

Cost and value

A 40' container costs more than a 20' in absolute terms, but because it holds about twice the volume, it usually delivers a lower price per cubic foot. So if you genuinely need the space, the 40' is the better value pound for pound. If you only need to fill a 20', paying for a 40' wastes both money and yard space.

Typical use cases

The 20' suits home storage, single-room renovations, small business inventory, jobsite tools, and tight urban sites. The 40' suits whole-home moves, larger inventory, equipment storage, and most container modification projects like offices or workshops where the extra length pays off.

A simple rule: if you can comfortably fit and afford the 40' and expect to grow into it, the better cost-per-cubic-foot makes it the smart buy. If space or budget is tight, the 20' is the dependable workhorse.

Ready to decide? Shipping Container World can quote both sizes at our guaranteed lowest price, with options to buy, rent, or rent-to-own, and nationwide depot delivery by tilt-bed truck in 3 to 7 business days. Request a free quote and we will help you match the right size to your site.